Spring device for chairs



'H. A. PARB. SPRING DEVICE FOR cums. APPLICATION HLED JAN.22,1918. RENEWED APR. 26, I921.

Patented N 0v. 8, 1921.

0 Weary/21 017:

' UNITED STATES PATENT OFFICE.

HENRY A. PARR, OF NEW YORK, N. Y.

Specification of Letters Patent.

Patented Nov. 8, 1921.

Application filed January 22, 1918, Serial No. 213,218. Renewed April 26, 1921. Serial No. 464,538.

To all whom it may concern:

Be it known that I, HENRY A. PARK, citizen of the United States, residin at New York city, in the county of New ork and State of New York, have invented certain new and useful Improvements in Spring Devices for Chairs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make anduse the same.

he invention is a spring device for chairs,

the object thereof being to resiliently support two legs of a chair, while permitting the chair to rock, to a limited extent, on the other two legs thereof.

Figure 1 is a perspective view, showing the device in position of use under the front legs of a chair;

Fig. 2 is a view of the device in elevation, parts thereof being broken away, and

Fig. 3 is a sectional view taken on the line 3--3, of Fig. 2.

The principal elements of the device are the base plate A; the top plate, B; the springs, G, and the securing, tension-producing bolts, D.

The base plate, A, consists of a relatively narrow strip of metal, or other suitable ma terial, having near its ends spaced rivet holes, a, and having at intermediate points bolt holes, a.

The top plate, B, is narrower than the base plate, A, and of nearly the same length. It has a flat middle portion, 6, disposed between two depressed portions, 6, in which are bolt holes, 5 coinciding with the bolt holes, a, in the base plate A. The extremities of the top plate, B, are transversely curved to receive and insure retention of the legs of the chair, and are provided with rivet holes, 72

The springs (l, are preferably of tapering helical form, whereby the coils will nest, one within another, under load, to give the maximum range of movement when the chair is rocked. These springs are secured to the base, A, by clips, E, and rivets, e, extending through the holes, a, in the base, and are fastened to the top plate, B, by similar clips, E, held in place by rivets, 6, passed through the holes, 6

The tension bolts, D, are of sufficient length to give the desired resilience to the springs, C, by their adequate compression.

The base plate, A, may be curved from end to end, as shown, to thereby increase the resiliency of the whole device to some extent.

I do not limit myself to the exact forms and arrangements of the parts, as shown and described, as these may be varied to some extent, without departing from the spirit of my invention.

The device possesses the advantage of be ing complete in and of itself, and capable of application to an ordinary chair without the employing of fastening means of any kind, since the grooves of the transversely curved ends of the top plate, 13, constitute seats which prevent displacement of the legs of the chair.

It, furthermore,'has the capability of being used in connection with chairs having differently spaced legs, the said grooves being of sufficient length and of such disposition, as to receive two of the legs of any ordinary chair.

Having fully described my invention, what I claim, and desire to secure by Letters Patent is:

1. A spring support for a chair, including a base plate, a top plate, springs for sustaining the top plate, and tension members for drawing'one of said plates toward the other plate against the opposition of said spring. I

2. A spring support for a chair, including a bottom plate, a top plate, springs separating said plates and having a helical tapering form, and tension members extending from plate to plate, said tension members being capable of varying the adjustment of springs.

3. A spring support for a chair, includ ing a bottom plate, a top plate, springs, and tension members; said top plate having depressed seats for the tension members.

4. A spring support for chairs, comprising a base plate, a top plate, springs, clips securing said springs to said plates, and tension members extending through said plates for compressing said springs.

In testimony whereof, I afiix my signature.

HENRY A. PARR. 

